Gemstone



FIG. 1 is a top plan view of a gemstone showing my new design;

FIG. 2 is a bottom plan view;

FIG. 3 is a front elevational view;

FIG. 4 is a side elevational view;

FIG. 5 is a side elevational view taken in the direction 5--5 of FIG. 1; and,

FIG. 6 is a perspective view. 

The ornamental design for a gemstone, as shown and described. 